Divide the object's mass by its volume to find the density. Typically, the density of an object is related to the density of water—if your object's density is greater than 1.0, it will sink.
This educational webpage from "The Math You Need, When You Need It" teaches geoscience students how to calculate density and specific gravity, covering core concepts such as mass, volume, density equations, real-world applications in geology, and interactive examples with practice problems.
Density is how much matter is contained within a volume. A dense object weighs more than a less dense object of the same size. An object less dense than water will float on it; one with greater density will sink. The density equation is: density equals mass per unit volume or D = M / V.